Bulletin d’avalanche

South Coast

Apr 6 – 7, 2018Avalanche Canada
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Archivé · expiré 8 years ago

Danger d’avalanche

Sun
Mon
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
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Points saillants

More precipitation is forecasted for Saturday, with snow at high elevations and rain below. Be cautious of periods of rapid precipitation loading, as avalanche activity may increase.

Problèmes avalancheux

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2
    Snowfall at higher elevations has formed new slabs. More snow is forecasted for Saturday, which will build thicker slabs. Observe for the bond of new snow with the old surface before committing into avalanche terrain.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Precipitation will fall as rain at lower elevations, saturating and weakening the upper snowpack. Watch out in steep and gullied terrain, where small avalanches can build and have severe consequences.

Confidence

Moderate - Intensity of incoming weather systems is uncertain

Weather Forecast

SATURDAY: Cloudy with snow at higher elevations and rain below, accumulation 20 to 30 mm water equivalent, strong southerly winds, treeline temperature 3 C, freezing level 1600 m.SUNDAY: Mostly cloudy with early-morning precipitation, accumulation 10 to 20 mm water equivalent, light westerly winds, alpine temperature 1 C, freezing level 1400 m.MONDAY: Mostly cloudy, light southwesterly winds, alpine temperature 2 C, freezing level 1600 m.

Avalanche Summary

On Thursday, it was easy to initiate large wet loose avalanche in steep terrain below treeline. The avalanches were generally slow but ran far.

Snowpack Summary

Around 15 to 60 mm of rain fell on the snowpack up to around 1700 m on Thursday and Friday, with precipitation as snow above. More of the same is forecasted for Saturday. In alpine terrain, the snow will create new storm slabs. This snow overlies variable surfaces including crusts and facets, which are more likely to be problematic on shady aspects. The snowpack below this is generally strong.At treeline and below treeline elevations, a spring snowpack exists. Rain is saturating and weakening the upper snowpack, allowing for loose wet avalanches. This wet snow may freeze overnight at higher elevations with cool temperatures. The mid and lower snowpack are strong.

Régions couvertes